期刊
JOURNAL OF POWER SOURCES
卷 269, 期 -, 页码 760-767出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2014.07.031
关键词
Carbon nanotubes; Manganese dioxide; Hybrid; Core-shell; Supercapacitors
资金
- National Natural Science Foundation of China [51104194]
- Doctoral Fund of Ministry of Education of China [20110191120014]
- 43 Scientific Research Foundation for the Returned Overseas Chinese Scholars, National Key laboratory of Fundamental Science of Micro/Nano-device and System Technology [2013MS06]
- State Education Ministry and Fundamental Research Funds for the Central Universities [CDJZR12248801, CDJZR12135501, CDJZR13130035]
Three-dimensional carbon nanotubes@MnO2 core shell nanostructures grown on Ni foam for binder-free capacitor electrodes have been fabricated by a floating catalyst chemical vapor deposition process and a facile hydrothermal approach. Ultrathin layered MnO2 nanosheets are uniformly coated on the surface of the carbon nanotubes (CNTs), directly grown on Ni foam. This unique well-designed binder-free electrode exhibits a high specific capacitance (325.5 F g(-1) at a current density of 0.3 A g(-1)), good rate capability (70.7% retention), and excellent cycling stability (90.5% capacitance retention after 5000 cycles), due to the high conductivity of the close contact between CNTs and Ni foam, as well as the moderate specific surface area of the CNTs@MnO2 core shell nanostructures. The developed synthetic strategy may provide design guidelines for constructing advanced binder-free supercapacitors electrode. (C) 2014 Elsevier B.V. All rights reserved.
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